Drilling machine



Sept. 8, 1936. c. A. HIRSCHBERG DRILLING MACHINE Filed Sept. 8, 1955 2 Sheets-Sheet 1 IN VEN TOR Cues. GHIRSQHBERG DRILLING MACHINE c. A. HIRSCHBERG Filed Sept. 8, 1955 Il/lI/I/lrlrflll/llllfllrl/l/d ElllfIW/fl/ ll Sept. 8, 1936.

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@N MN MN KR MN VN NW O m6 Patented Sept. 8, 1936 UNITED STATES DRILLING MACHINE Charles A. Hirschberg, Mountain Lakes, J., assignor to Worthington Pump and Machinery Corporation, New York, N. Y., a corporation of Virginia Application September 8, 1933, Serial No. 688,553

7 Claims.

This invention relates to drilling machine or percussive tool, and more particularly to a feed mechanism for feeding the tool to its work.

An object of the present invention is to provide a feeding mechanism for rock drills or analogous percussive tools, which will occupy a relatively small space and provide a relatively great feeding range for the drill.

Another object of the invention is to provide a combined manual and pneumatic feed mechanism whereby a percussive tool may be automatically or pneumatically fed to its work for a predetermined distance, after which the pneumatic feeding mechanism may be manually reset for further feeding of the tool without in any way effecting or disturbing the mounting of the tool, thereby providing a wide range of pneumatic feeding of the tool with a mechanism which occupies a minimum amount of space.

A further object of the present invention is to provide a combined pneumatic and manual feed mechanism for rock drills or analogous percussive tools which is: so constructed that the pneumatic feed mechanism may be locked and the tool fed entirely by hand, or one with which the tool may be fed through a part of its desired scope pneumatically, then fed to the remainder of the scope of its distance manually, or vice versa.

With these other objects in view, as may appear from the accompanying specification, the invention consists of various features of construction and combination of parts, which will be first described in connection with the accompanying drawings, showing a drilling machine of the pre- F ferred form embodying the invention, and the features forming the invention will be specifically pointed out in the claims.

In the drawings: 7

Figure 1 is a longitudinal section of the drilling machine showing the feeding mechanism in its contracted condition or at the start of feeding movement, and showing the rock drill inside elevation.

Figure 2 is a longitudinal section through the drilling machine showing the feeding mechanism in its extended position, and also showing the rock drill inside elevation.

Figure 3 is a cross section on the line 3-3 of Figure 1. I

Figure 4 is an enlarged detail section of the valve'and passages employed for controlling the delivery of the pressure fluid to the feeding mechanism.

Figure 5 is a fragmentary view, partly in section and partly in elevation, of the valve, showing it in one position. v

Figure 6 is a detail section of the valve and control passage. features of the feeding mechanism and showing the valve in a different posi- 5- tion from that shown in Figure 4 of the drawings.

Figure 7 is a view similar to Figure 5, namely a section and elevation of the valve and its casin and showing it in a different position from that shown in Figure 5. r

Figure 8 is an enlarged and detailv section through a part of the feeding mechanism showing the structure, for. converting the feeding mechanism to manual operation and is taken on the line 88 of Figure 9. I

Figure 9 is a detailedcross section throughv the locking mechanism and taken on the line 9--9 of Figure 8. r

Referring more particularly to the drawings, the improved drilling machineicomprisesa guiding shell 1 which has a trunnion 2 formed thereonfor facilitating the attachment of a drill ing machine to a suitable. support (not shown).

The guiding shell I has ways 3 formed therein at its upperedge which receive the guide rails, 4 since the guide rails 4 are welded to or otherwise suitably formed upon or attached to the feed cylinder 5. which is mounted for guided sliding movement over the guiding shell I for moving the rock drill 6 forward and feeding it to its work, or for moving it rearwardly and withdrawing it from its work. The rock drill or other percussive tool 6 may be of any approved type or construction and it is attached to the feed cylinder 5 by means of ears I and bolts 8 .to provide a firm and rigid connection between the feed cylinder 5 and the rock drill or percussive tool.

A piston I0 is mounted in the feed cylinder 5 and itv has a hollow piston rod II connected thereto which extends along the guiding shell I and has a feed nut l2 formed on its other end. The feed nut 12 is supported by the movable feed nut guiding support l3 which moves along the spreader l4 of the drilling machine, and a limited distance along the guiding shell I. A suitable way I5 is formed in the guiding shell I through which the feed nut supporting guide l3 moves.

In Figure 2 of the drawings, the feed nut supporting guide I3 is shown moved forwardly to the limit'of its forward movement and to the forward limit of the way l5.

A manually rotated feed screw 16 extends through the nut l2 and it is supported in a 55 feed screw yoke I! attached to the outer end of the spreader M. A crank handle l8 of the usual approved construction is attached to the feed screw l6 for rotating it.

A suitable passage 20 is provided which has communication with the pressure fluid inlet passage to the drill 6 and the passage ofthe pressure fluid into the passage 20 may be controlled by the throttle valve 2| of the percussive drill 6 in any of the approved manners. The passage 20 is provided for delivering the pressure fluid into the cylinder 5 for action against the piston ID to move the feed cylinder 5 and the percussive drill 6 either forwardly to feed the drill to its work, or rearwardly to withdraw the drill from its work. depending upon the side of the piston l0 against which the pressure fluid is admitted.

A valve 22 is provided for controlling the distribution of the pressure fluid to the feed cylinder 5 and when this valve 22 is adjusted in the position as shown in Figure 4 of the drawings the pressure fluid from the passage 20 will travel through the arcuate groove 23 in the cone valve 22, into the passage 24. From the passage 24, the pressure fluid will pass into the circular groove 25 formed in the upper face of the block 26, and downwardly through the passage 21 into the pipe 28. As clearly shown in Figure 2 of the drawings, the pipe 28 extends along the feed cylinder 5 and opens outwardly through a port 29 into the feed cylinder near its forward end so that when the piston i0 is at the forward end of the feed cylinder 5 and more in the position as shown in Figure 1 of the drawings, the pressure fluid entering the cylinder 5 outwardly of the forward side or end of the piston It! will act on the piston, and since the piston is held stationary by means of the feed screw 16, feed nut l2 and guide I3, the pressure fluid acting upon the piston will move the feed cylinder 5 and the percussive drill 6 carried thereby forwardly to its work. The speed of the forward movement of the cylinder 5 and the drill 6 will be regulated by the speed of the drilling operation on the drill bar indicated at 3". so that a drill bar will always be held against the-surface which it is cutting or drilling and the drill 6 will be fed to the work in direct proportion to the speed of the drilling.

While the pressure fluid is being fed to the forward end of the feed cylinder 5, through the pipe 28, the portion of the feed cylinder 5, rearwardly of the piston I0, is open to atmosphere through the passages 3| and 32, the angular groove 33 formed in the valve 22 and the exhaust port 34 formed in the valve block 35, thus any pressure fluid which might have been in the cylinder behind the piston ID is permitted to bleed to atmosphere. After the drill hole has been drilled to the desired depth, the valve 22 is rotated to the position as shown in Figures 6 and '7 of the drawings, at which time, the arcuate groove 23 establishes communication between the passageway 20 and the passage 32 and port 3| to admit the pressure fluid into the feed cylinder 5 behind the piston Ill so that the pressure fluid will exert its pressure against the rear end of the feed cylinder 5 and move the feed cylinder and the percussive drill 6 carried thereby rearwardly or away from the work. At the time that the arcuate curve passage 23 formed in the valve 22 communicates with the passage 32, the angular passage 33 will communicate with the passage 24 and the exhaust port 34 to permit the exhausting or bleeding of the pressure fluid from the feed cylinder 5 in front of the piston I 0.

When the drilling machine is first started, and the drill 6 and feed cylinder 5 in the position as shown in FigLu'e 1 of the drawings, the admission of pressure fluid to the forward end of the cylinder 5 through the port 29 will move the feed cylinder and the percussive drill 6 forwardly the length of the cylinder, less the length of the piston l8. When the cylinder has been moved forward to this point, the feed screw it may then be rotated for feeding the piston ID along the cylinder 5 and moving it to the forward end of the cylinder, during which time the cylinder and drill are stationary. The moving of the piston it) forwardly to the forward end of the cylinder again positions the feeding mechanism for further forward feeding of the feed cylinder 5 and drill 6 by means of the pressure fluid so that when the Valve 22 is again moved into the position as shown in Figure 4 of the drawings, the feed cylinder 5 drill 6 will be set forwardly a second step constituting a distance substantially equal to the length of the feed cylinder 5 less the length of the piston it). Figure 2 of the drawings shows the feed cylinder 5 and drill 6 led forwardly to their maximum position; that is, after the piston 10 has been moved forwardly in the cylinder 5 by means of rotation of the feed screw it during which time the feed nut l2 and the feed nut supporting guide l3 moves forwardly over the spreader l4 and the way I 5,

Means are provided, so that if it is desired to feed the drill 6 forwardly by hand, or manually, without operation of the pneumatic or pressure feed mechanism, this may be done. A means to prevent manual feeding of drill 6 comprises a locking mechanism shown in detail in Figures 8 and 9 of the drawings by means of which the piston rod l I may be locked to the cylinder 5 so as to prevent relative movement of the cylinder 5 and the piston 19 so that when the feed screw i6 is rotated through the medium of the crank iii, the piston l8, feed cylinder 5, and drill 6 will all be set forwardly together.

While a specific type of locking mechanism is illustrated in Figures 8 and 9 of the drawings, it is to be understood that any suitable type of locking mechanism may be employed, for the purpose of connecting the piston and cylinder for simultaneous movement, without departing from the spirit of this invention.

The locking mechanism illustrated in Figures 8 and 9 comprises a locking wedge nut G9 which is threaded to the outer surface of the packing gland M of the stufling box structure 42. The stuffing box structure 12 is connected to the cylinder 5 and forms a seal between the cylinder 5 and the piston rod H. Wedges 43 are placed within the wedging block locking nut Q0 and inner arcuate edges engage the piston rod ll while their outer inclined sides 44 are engaged by the tapered bore 45 in the locking nut 66 so that when the locking nut 43 is threaded forwardly upon the gland 4! it will wedge the locking wedges 43 tightly against the piston rod H as well as against the arcuate tapered bore 45 of the locking nut and securely lock the cylinder 5 and piston rod l I together for unitary movement.

From the foregoing description taken in connection with the accompanying drawings, it will be apparent that a drilling machine has been provided, in which a feeding mechanism is embodied for feeding the rock drill or other percussive tool to the work, in proportion with the speed of drilling maintained, which is relatively simple in construction, will occupy the minimum amount of space and provide a maximum feeding range through the adjustment or positioning of the piston after the feed cylinder and drill 6 have moved to the first length limit of their movements by action of the pressure fluid. It will also be apparent, that the improved feeding mechanism may be either operated manually, by means of the feed screw l6 and crank I8 to provide manual feeding of the drill 6 to its work, by the locking of the cylinder 5 to the piston rod l l, and also that if it is so desired, the drill may be set for a part of its desired scope of feed drilling movement by the pneumatic feed and continue to the limit of its scope by manual feed, depending upon the drilling condition, and the desire of the operator.

It will be understood that the invention is not to be limited to the specific construction or arrangement of parts shown but that they may be widely modified within the invention as defined by the claims.

What I claim is:

1. In a drilling machine, the combination with a drill, of a feed cylinder connected to said drill, a guiding shell for said feed cylinder, pressure operated means for moving said cylinder along said guide, a valve for controlling the supply of pressure fluid to said pressure operated means whereby said pressure operated means may be rendered inactive, and manually operable means for moving said cylinder being normally disconnected from said cylinder, and locking means for connecting said manually operable means to said cylinder to provide for manual drilling feeding movement of the cylinder.

2. In a drilling machine, the combination, of a guide shell, a feed cylinder slidably carried by said guide shell, a rock drill carried by said feed cylinder, a piston in said cylinder, a piston rod connected tosaid piston, a support for said piston rod slidably supported by said shell, a manually operated feed screw connected to said piston rod for moving said piston relative to said cylinder and shell for repositioning the piston in the cylinder, and adjustable means to permit rigid connection of the cylinder and piston rod whereby the cylinder and piston will move in unison.

3. In a drilling machine, the combination, of a guide shell, a feed cylinder slidably carried by said guide shell, a rock drill carried by said feed cylinder, a piston in said cylinder, a piston rod connected to said piston, a support for said piston rod slidably supported by said shell, a manually operated feed screw connected to said piston rod for moving said piston relative to said cylinder and shell for repositioning the piston in the cylinder, adjustable means to permit rigid connection of the cylinder and piston rod whereby the cylinder and piston will move in unison, said adjustable means being releasable to permit movement of the cylinder independent of movement of the piston, and means for controlling the admission and discharge of pressure fluid to and from said cylinder for moving the cylinder.

4. In a drilling machine, the combination, of a guide shell, a feed cylinder slidably carried by said guide shell, a rock drill carried by said feed cylinder, a piston in said cylinder, a piston rod connected to said piston, a support for said piston rod slidably supported by said shell, a manually operated feed screw connected to said piston rod for moving said piston relative to said cylinder and shell for repositioning the piston in the cylinder, adjustable means to permit rigid connection of the cylinder and piston rod whereby the cylinder and piston will move in unison, said feed screws serving to connect said piston and piston rod to said shell to prevent movement of the piston when said feed screw is not rotated.

5. In a drilling machine, the combination with a rock drill of means for pneumatically or manually feeding the drill to its work comprising, a feed cylinder connected to said drill, a guiding shell for said feed cylinder, a piston in said cylinder, a valve for controlling admission of pressure fluid to said cylinder for moving the cylinder along said guide, a feed screw connected to said piston, said feed screw and piston normally disconnected from said cylinder to permit movement of the cylinder under action of pressure fluid, and means for connecting the feed screw and cylinder for moving the cylinder by manual rotation of the feed screw.

6. In a drilling machine, the combination with a rock drill of means for pneumatically or manually feeding the drill to its work, comprising a feed cylinder connected to said drill, a guiding shell for said feed cylinder, a piston in the cylinder, a valve for controlling admission of pressure fluid to said cylinder for moving the cylinder along said guide, a hollow piston rod connected to said piston, a feed screw carried by said guiding shell and threadable into said hollow piston rod to manually move the piston relative to the cylinder and to hold the piston against movement relative to said shell, said cylinder normally movable under pressure fluid relative to the piston, and means for connecting said piston rod and cylinder for moving the cylinder by manual rotation of the feed screw.

'7. In a drilling machine, the combination with a ropk drill of means for pneumatically or manually feeding the drill to its work, comprising a feed cylinder connected to said drill, a guiding shell for said feed cylinder, a piston in the cylinder, a valve for controlling admission of pressure fluid to said cylinder for moving the cylinder along said guide, a hollow piston rod connected to said piston, a feed screw carried by said guiding shell and threadable into said hollow piston rod to manually move the piston relative to the cylinder and to hold the piston against movement relative to said shell, said cylinder normally movable under pressure fluid relative to the piston, a clamping collar carried by said piston and surrounding said piston rod, and a clamping nut on said clamping collar for connecting said cylinder to said piston rod whereby said cylinder will be moved along said guide by manual rotation of the feed screw.

CHARLES A. HIRSCHBERG. 

